Fixes #708 SUMMARY_MAX_LENGTH=0 should return empty string
Merge pull request #867 from avaris/summary-max-length

Fixes #708 SUMMARY_MAX_LENGTH=0 should return empty string
Add warning to docs re: DELETE_OUTPUT_DIRECTORY
Make tags and cats case insensitive. Fixes #704.

More precisely, group tags or categories without considering the case.
This fixes the bug where two categories with just the case as difference were
considered as distinct, but generate the same file: one overwriting the other.

Thanks to @Avaris for helping with the tests.
Merge pull request #845 from Rogdham/case-insensitive_caterogy_tag

Make tags and cats case insensitive. Fixes #704.
Handle critical exception logging correctly in localized systems

Python generates certain exception messages (like IOError) in system
language, if locale is set. This ensures that the message is properly
converted to unicode in Python 2.
Merge pull request #874 from avaris/non-ascii-error

Handle critical exception logging correctly in localized systems
Add reST example to arbitrary metadata FAQ entry
Add more detail to Pygments FAQ entry. Fixes #821